I don't think it existed before 1977.
Peter Jon White Peter White Cycles 24 Hall Rd. Hillsborough, NH 03244 603 478 0900 Phone 603 478 0902 Phax Peter@PeterWhiteCycles.com http://www.PeterWhiteCycles.com
> I started using the Sedisport in either 1974 or 1975 so it is a classic
chain, though it was revolutionary at the time. Claims to be lighter, more
flexible, and stronger it was the first bushingless chain available. Brian
in Berkeley